Show deactivated users

Closes #104

• create checkbox in UserList to show deactivated users when checked, and active users when not
• change UI elements to indicate that you are activating users when showing deactivated users
• create ACTIVATE_USERS query to use in Users page to activate non-active users
• update UserList story to reflect UI changes
• read isActive field from user query
• create DeactivatedUser component and page to show to deactivated users
• redirect deactivated users from restricted pages to the above mentioned page

Additional fixes:

• add ability to modify empty list text in Dashboard and Discover
• make pagination render consistently in QuetsionList and UserList